Check if LG issued new firmware and update to that. Check the manual of course and if this fails, consider return since the makers tend to not fix such later. Get products that work, return those that don't.
My LG tv is sending HDMI/arc to the sound bar but the sound bar keeps coming up HDMI. I have to change to HDMI/ARC using the SJ9 remote. How to make sound bar recognize HDMI/ARC input at startup?